Any recommended sound editing ipad apps for making Sci fi sound effects like in star wars

Been thinking it might be fun to try to make a small star wars fan animation but I've only done a bit of audio stuff in audacity a few years ago so not quite sure the exact things to look for but so far koala and wavebox looks promising however when looking into various apps I only saw those two have posts relating to music so before I spend money (went on a bit of a spending spree with other stuff this week) figured I would ask here what they recommend. Mainly looking for stuff that can make laser effects, the Sci fi helmet voice filter like what Boba fett and Vader got, and starship sounds. I assume most audio editors have a lot of overlap between music and sfx but figured it wouldn't hurt to ask. Mainly want to use iPad for this since at home my beloved cat loves to sync his claws into my arms if I don't give him attention so for doing different art I like to be portable and get out of the house and generally seems like ipad apps tend to be simple but competent.